package Ajax;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class AjaxSys extends HttpServlet {
	ServletConfig mConfig = null;

	private static final long serialVersionUID = 1L;

	private String strDriverName = "";
	private String strUserName = "";
	private String strPassword = "";
	private String strDriverUrl = "";

	private Connection mConn;
	private Statement mStmt;

	private AjaxPage mAjaxPage = null;

	public void init(ServletConfig config) throws ServletException {
		super.init(config);

		mConfig = config;

		strDriverName = config.getInitParameter("driverName");
		strUserName = config.getInitParameter("username");
		strPassword = config.getInitParameter("password");
		strDriverUrl = config.getInitParameter("driverUrl");
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws IOException, ServletException {
		request.setCharacterEncoding("utf-8");

		String str_action = request.getParameter("action");
		String str_option = request.getParameter("option");
		String str_submit = request.getParameter("submit");
		String str_resume = request.getParameter("info");
		String str_delete = request.getParameter("deletesubmit");

		boolean is_submit = (str_submit != null && str_submit.equalsIgnoreCase("1"));
		boolean is_delete = (str_delete != null && str_delete.equalsIgnoreCase("1"));

		if (str_action != null && str_action.equalsIgnoreCase("certifycode")) {
			getImage(request, response);

			return;
		}
//		HttpSession session = request.getSession(true);
//		String resume_id = (String) session.getAttribute("resume_id");

		if (str_action != null) {
			if (str_action.equalsIgnoreCase("personal")) {
				mAjaxPage = new PersonalPage(str_resume, request);
			} else if (str_action.equalsIgnoreCase("category")) {
				mAjaxPage = new CategoryPage(str_option);
			} else if (str_action.equalsIgnoreCase("checker")) {
				mAjaxPage = new CheckerPage(request);
			}
		}

		response.setCharacterEncoding("utf-8");

		if (is_delete) {
			response.setContentType("text/tml; charset=utf-8");
		} else if (is_submit) {
			response.setContentType("text/html; charset=utf-8");
		} else {
			response.setContentType("application/xml; charset=utf-8");
		}

		response.setHeader("Cache-Control", "no-cache");
		response.setHeader("Pragma", "no-cache");
		response.setHeader("Expires", "-1");

		try {
			initMysql();
		} catch (ClassNotFoundException | SQLException e) {
			e.printStackTrace();
		}

		PrintWriter writer = response.getWriter();

		if (mStmt != null && mAjaxPage != null) {
			try {
				mAjaxPage.execSql(mStmt, request);

				if (is_submit) {
					mAjaxPage.printHtml(writer);
				} else if (is_delete) {
					mAjaxPage.printDel(writer);
				} else {
					mAjaxPage.printXML(writer);
				}

				mStmt.close();
				mConn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

	private void initMysql() throws ClassNotFoundException, SQLException {
		Class.forName(strDriverName);

		mConn = DriverManager.getConnection(strDriverUrl, strUserName,
				strPassword);
		mStmt = mConn.createStatement();
	}

	private void getImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
		int width = 60;
		int height = 20;
		// 创建具有可访问图像数据缓冲区的Image
		BufferedImage buffImg = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);
		Graphics2D g = buffImg.createGraphics();
		
		// 创建一个随机数生成器
		Random random = new Random();
		
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, width, height);
		
		// 创建字体，字体的大小应该根据图片的高度来定
		Font font = new Font("Times New Roman", Font.PLAIN, 18);
		// 设置字体
		g.setFont(font);
		
		// 画边框
		g.setColor(Color.BLACK);
		g.drawRect(0, 0, width - 1, height - 1);
		
		// 随机产生160条干扰线
		g.setColor(Color.LIGHT_GRAY);
		for (int i = 0; i < 160; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int x1 = random.nextInt(12);
			int y1 = random.nextInt(12);
			g.drawLine(x, y, x + x1, y + y1);
		}
		
		// randomCode 用于保存随机产生的验证码
		StringBuffer randomCode = new StringBuffer();
		int red = 0, green = 0, blue = 0;
		
		// 随机产生4位数字的验证码
		for (int i = 0; i < 4; i++) {
			// 得到随机产生的验证码数字
			String strRand = String.valueOf(random.nextInt(10));
		
			// 产生随机的颜色分量来构造颜色值
			red = random.nextInt(110);
			green = random.nextInt(50);
			blue = random.nextInt(50);
		
			// 用随机产生的颜色将验证码绘制到图像中
			g.setColor(new Color(red, green, blue));
			g.drawString(strRand, 13 * i + 6, 16);
		
			randomCode.append(strRand);
		}

		// 将四位数字的验证码保存到session中
		HttpSession session = request.getSession();
		session.setAttribute("randomCode", randomCode.toString());

		// 禁止图像缓存
		response.setHeader("Pragma", "no-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);

		response.setContentType("image/jpeg");
		// 将图像输出到servlet输出流中
		ServletOutputStream sos = response.getOutputStream();
		ImageIO.write(buffImg, "jpeg", sos);
		sos.close();
	}
}
